answer Multiple choices Question

multiple choice (1/2 point each), Vigenere cipher (1 point), 8-bit rounds (3 points each). Total = 10 points.

1. X.509 certificates are based on the standard issued by:

___ The United States Government

___ International Standards Organization

___ Microsoft

___ International Telecommunications Union

2. ______________________ are controlled by the network resource manager making a decision about allowing or denying a request to access an object by a user and the security level of the object. In this approach, users are given a security clearance level and data are classified, with the classification stored in the security labels of the resource.

___ Distributed access managers (DAM)

___ Permitted access controls (PAL)

___ Mandatory access controls (MAC)

___ Configured access levels (CAL)

3. A pessimistic security stance:

___ Only permits those actions specifically allowed

___ Is the same thing as a blacklist

___ Permits actions unless they are explicitly denied

___ Is usually the default setting in router firewalls

4. HTTPS uses SSL.

___ True

___ False

5. The DES cipher is based on the Feistel algorithm:

___ True

___ False

6. A potentially dangerous feature in Microsoft Windows that allows interactive objects in a Web page is:

___ ActiveX

___ Active Directory

___ SAM

___ HAL

7. Vigenere Cipher: What is the cyphertext?

Plaintext = SPYATHQ

Key = CQMJD

Ciphertext = ________________________________

8 & 9. Complete the next two 8-Bit cipher rounds:

Round 1: complete the round with key half 1100

	L1	L2	L3	L4	R1	R2	R3	R4
PlainText	0	0	1	1	0	1	1	0
Subkey
Apply Round Function to Rbits
Round Function Result
XOR with Lbits
Swap halves

Round 2: complete the next round (using the results from round 1) with key half 0111

	L1	L2	L3	L4	R1	R2	R3	R4
PlainText
Subkey
Apply Round Function to Rbits
Round Function Result
XOR with Lbits
Swap halves